Platform docs: Add a page to explain how to render HTML from a list of blocks

[youknowriad]

Related #53874

What?

This PR add a small documentation page explaining how to possibly render a block list edited using the Gutenberg Block Editor.

It is very basic at the moment, and also it's not complete since we're missing the work in #54047

Test the documentation website

cd platform-docs
npm install
npm start

[github-actions]

Flaky tests detected in 602bf35.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/6453722676
📝 Reported issues:

• [Flaky Test] should partially select with shift + click (@webkit) #53524 in /test/e2e/specs/editor/various/multi-block-selection.spec.js

[andrewserong]

Looks like a good place to begin to me! Thanks for flagging in the docs that including all styles is a "to do" item for now.

If needed, we could always list each of the block supports that aren't yet supported, but I imagine we probably don't need to go into that level of detail just yet?

[aaronrobertshaw]

LGTM

Left a tiny nit in addition to Ramon's.

[youknowriad]

If needed, we could always list each of the block supports that aren't yet supported, but I imagine we probably don't need to go into that level of detail just yet?

Putting myself on a third-party dev mode, I feel it's not really necessary but I think it'd be helpful to note in #54047 which should clarify the remaining work.